The main cause of caldera collapse is
A. removal of magmas that form pillow basalt.
B. a fissure eruption that allows the shield volcano to split into two or more parts.
C. collapse of the north flank by landslides.
D. collapse of the roof of a magma chamber as magma erupts.
E. All of these choices are correct.
Answer: D
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European rabbits were introduced into Australia and quickly spread, reproduced, and became a terrible pest. They eat up to $600 million worth of food and pasture crops annually, and have damaged the populations of many native plants and the populations
of animals that eat the plants. Twice in the past 50 years, rabbit diseases have been introduced to try to control the population, with some success. This is a case where ________. A) an extirpation has occurred B) habitat alteration resulted in decreased biodiversity C) climate change has decreased the genetic diversity of indigenous species D) an invasive species has caused overharvesting E) an invasive species has reduced the genetic diversity of indigenous species
If you mix a typical iodine ion (I, atomic no. = 53 ) with a typical barium ion (Ba, atomic no. = 56), what compound is formed?
A) BaI2 B) BaI C) Ba56I53 D) Ba2I E) Ba2I2
What can you conclude from the fact that the states in the U.S. having the lowest landslide severity are
all either in the central part of the country or are in coastal areas? What will be an ideal response?
Airplanes measure their altitude using
A) a mercury barometer. B) an anemometer. C) a hygrometer. D) an aneroid barometer. E) sextants.